Abstract: This paper presents a design aimed at achieving optimal performance within the designated frequency range of 12GHz to 18GHz.The proposed antenna exhibits low side lobes, high bandwidth, high gain, and good impedance matching. This antenna was created using EM simulation software (CST Microwave Studio) and features a rectangular patch with two HSRR (Hexagonal Split Ring Resonator) slots that can be utilized to increase bandwidth and gain. The design features an 8mm x 5mm microstrip patch with FR4 substrate for the Ku band applications. The antenna achieves gains of 4.11dBi and 3.51dBi, a VSWR of 1.01 and a wide bandwidth of 4.8GHz. This antenna resonates with dual frequencies at 13.33GHz and 15.854GHz.

Keywords: Ku-band, Satellite Communication, Microstrip Patch Antenna, Antenna Design, Gain, Side Lobes, Impedance Matching, Return Loss, Radiation Pattern, CST Microwave Studio.

| DOI: 10.17148/IARJSET.2025.12453